code: def _identity(X):
      """The identity function."""
      return X
  
file_path: cuml/python/cuml/_thirdparty/sklearn/preprocessing/_function_transformer.py
imports: import warnings
  import cuml
  from ....internals.array_sparse import SparseCumlArray
  from ..utils.skl_dependencies import TransformerMixin, BaseEstimator
  from ..utils.validation import _allclose_dense_sparse
  from ....internals import _deprecate_pos_args
label_desc: Use image node_id 1 for calling a global function with example usage: _identity(X) and returns: X